1 files changed, 38 insertions, 0 deletions
diff --git a/winsup/cygwin/math/llroundl.c b/winsup/cygwin/math/llroundl.c
new file mode 100644
index 000000000..fc600e77d
--- /dev/null
+++ b/winsup/cygwin/math/llroundl.c
@@ -0,0 +1,38 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the mingw-w64 runtime package.
+ * No warranty is given; refer to the file DISCLAIMER.PD within this package.
+ */
+#include <math.h>
+#include <limits.h>
+#include <errno.h>
+
+long long
+llroundl (long double x)
+{
+  long double res;
+
+  if (x >= 0.0L)
+    {
+      res = ceill (x);
+      if (res - x > 0.5L)
+        res -= 1.0L;
+    }
+  else
+    {
+      res = ceill (-x);
+      if (res + x > 0.5L)
+        res -= 1.0L;
+      res = -res;
+    }
+  if (!isfinite (res)
+      || res > (double) LLONG_MAX
+      || res < (double) LLONG_MIN)
+    {
+      errno = ERANGE;
+      /* Undefined behaviour, so we could return anything.  */
+      /* return res > 0.0 ? LLONG_MAX : LLONG_MIN;  */
+    }
+  return (long long) res;
+}
+